1212120331203 has 4 divisors (see below), whose sum is σ = 1616160441608. Its totient is φ = 808080220800.

The previous prime is 1212120331181. The next prime is 1212120331217. The reversal of 1212120331203 is 3021330212121.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1212120331203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212120331203.

It is not an unprimeable number, because it can be changed into a prime (1212120331243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202020055198 + ... + 202020055203.

It is an arithmetic number, because the mean of its divisors is an integer number (404040110402).

Almost surely, 2^{1212120331203} is an apocalyptic number.

1212120331203 is a deficient number, since it is larger than the sum of its proper divisors (404040110405).

1212120331203 is an equidigital number, since it uses as much as digits as its factorization.

1212120331203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404040110404.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1212120331203 its reverse (3021330212121), we get a palindrome (4233450543324).

The spelling of 1212120331203 in words is "one trillion, two hundred twelve billion, one hundred twenty million, three hundred thirty-one thousand, two hundred three".